There are 3 titles associated with this firm.

Richardson , C.E. (1828). Poems, by mrs. g. g. richardson, dumfries. Edinburgh: Robert Cadell and Co. [41 St. Andrew Street] Simpkin, Marshall and Co. William Crofts.
Richardson , C.E. (1828). Poems, by mrs. g. g. richardson, dumfries. second edition. Edinburgh: Robert Cadell and Co. [41 St. Andrew Street] Simpkin, Marshall and Co. William Crofts.
Richardson , C.E. (1834). Poems by mrs. g. g. richardson. second series. London: Robert Cadell and Co. [31 St. Andrew Square 1830, 1833-1850] William Crofts.